The brachial plexus is a set of nerves that originate in C5, C6, C7, C8 and T1 sections of the spinal cord and extend outwards into the chest, shoulder and down into the arms and hands. Brachial plexus injuries are usually traumatic in nature (although not always); usually a result of either birth injuries, e.g. Erb’s Palsy – where the shoulder /neck is violently / sometimes negligently hyperextended or subject to excessive forces to accommodate a difficult birth. In adults any kind of lateral shoulder/neck/head trauma, especially after motorcycle accidents, where the brachial plexus nerves are overstretched, lacerated or even severed completely. An injury or disease may cause scar-tissue formation or inflammation to the brachial plexus area that places pressure on those nerves, causing the same symptoms.